Len
Invariably, as others have already stated, the problem should disappear upon complete drying.
Occasionally there can be a problem though. The most common is with woven construction carpets, particularly wiltons. If the fitting is defective somewhere e.g under a radiator (quite common) then the carpet will shrink in one direction causing the carpet to ripple. Easily rectified after about a week, with a repair to the faulty fitting and a re-stretch.
Safe and happy cleaning:)
Ken